CN105547504A - Vacuum furnace thermocouple installation leakage-prevention device - Google Patents

Abstract

The invention discloses an anti-leakage device for vacuum furnace thermocouple installation, which comprises a mounting seat (2), a sealing gasket (3), and a casing nut (6), and is characterized in that: the front part of the mounting seat (2) is fixedly connected with a pipe body (1), gasket (3), and pressure sleeve (4) are installed in the inner cavity of the mounting seat (2) in sequence, the gasket (3) and the pressure sleeve (4) are positioned through the end face, and the pressure sleeve (4) and A stop pin (5) is installed between the mounting bases (2), and the outer casing nut (6) is detachably mounted on the outside of the mounting base (2), and the outer casing nut (6) is pressed on the outer end surface of the compression sleeve (4) . The stop pin (5) is installed in the pin hole (7) provided on the mounting base (2). The invention has the advantages of simple structure, convenient assembly and disassembly, reliable sealing and low cost, and is suitable for popularizing and using the anti-leakage installation of thermocouples in vacuum furnaces.

Description

Vacuum furnace thermocouple installation anti-leakage device

technical field

The invention belongs to the technical field of thermocouple installation, and in particular relates to an anti-leakage device for vacuum furnace thermocouple installation.

Background technique

Vacuum heat treatment furnace is a heat treatment furnace that puts the workpiece in a vacuum environment for heat treatment. Vacuum heat treatment can improve the surface quality and mechanical properties of the workpiece after heat treatment. It is one of the advanced heat treatment processes used in today's machinery manufacturing industry. First, it has a wide range of applications, especially in the aerospace industry.

One of the key technical indicators of the vacuum furnace is to ensure that the furnace leakage rate (or pressure rise rate) does not exceed a certain indicator, such as: the leakage rate of the vacuum furnace for processing titanium alloys, brazing, etc. does not exceed 0.67Pa/hour, and the processing of steel parts The leakage rate of the vacuum furnace does not exceed 1.33Pa/hour. The seal of the vacuum furnace hearth is not reliable. If leakage occurs during the heat treatment of the workpiece, the light one will cause the workpiece to be oxidized and corroded, and the severe one will cause the furnace hearth to burn.

The furnace temperature control of vacuum furnace heating uses thermocouples to monitor the furnace temperature. The thermocouples pass through the furnace wall to connect with the external temperature display, recorder and controller. The installation of the thermocouple and the furnace wall perforation must be sealed. The tightness needs to withstand the impact of positive-negative air pressure difference. The existing thermocouples are installed in various ways, and the main problems are: the seal is easy to fail under the alternating action of positive and negative pressure in the furnace; it is inconvenient to install and disassemble the thermocouple, and it is easy to damage the thermocouple wire during installation and disassembly; Use adhesives such as resin for sealing, so that the resin is difficult to remove after the thermocouple is disassembled, and the thermocouple cannot be used again. Thermocouple wires made of precious metals such as platinum and rhodium are scrapped after being used once, and the cost is relatively expensive.

Contents of the invention

The object of the present invention is to overcome the above-mentioned shortcomings and provide a vacuum furnace thermocouple installation leakage prevention device with simple structure, convenient disassembly and assembly, reliable sealing and low cost.

The purpose of the present invention and its main technical problems are solved by adopting the following technical solutions:

The vacuum furnace thermocouple installation anti-leakage device of the present invention includes a mounting seat, a sealing gasket, and an outer casing nut, wherein: the front part of the mounting seat is fixedly connected with a pipe body, and the sealing gasket and the pressure sleeve are sequentially installed in the inner cavity of the mounting seat, sealing The pad and the pressure sleeve are positioned through the end faces, a stop pin is installed between the pressure sleeve and the mounting seat, and the outer sleeve nut is detachably installed outside the mounting base, and the outer sleeve nut is pressed on the outer end surface of the pressure sleeve.

The vacuum furnace thermocouple is equipped with an anti-leakage device, wherein: the tube body and the mounting seat are welded together.

The vacuum furnace thermocouple is equipped with an anti-leakage device, wherein: the tube body is a stainless steel casing.

The vacuum furnace thermocouple is equipped with an anti-leakage device, wherein: the sealing gasket is made of dimethyl vinyl siloxane.

The anti-leakage device installed on the vacuum furnace thermocouple, wherein: the stop pin is installed in the pin hole provided on the mounting base.

The above-mentioned vacuum furnace thermocouple is equipped with an anti-leakage device, wherein: the outer casing nut is connected with the mounting seat through threads.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. It can be seen from the above technical solutions that in the vacuum furnace thermocouple installation leakage prevention device of the present invention, the front part of the installation seat is welded with a pipe body, which is mainly used to place the thermocouple and install and fix it on the furnace body where the thermocouple is placed. The fixing method can be Through clamps, threads or other methods; the gasket is installed in the inner cavity of the mounting seat to play a sealing role; the pressure sleeve is installed in the inner cavity of the mounting seat, the gasket and the pressure sleeve are positioned through the end face, and the pressure sleeve acts as a squeeze seal The pad is deformed; there is a stop pin between the pressure sleeve and the mounting seat to prevent the pressure sleeve and the gasket from being twisted and damaged by the rotation of the sleeve nut; the sleeve nut is detachably installed outside the mounting base, and the sleeve nut presses Fitted on the outer end surface of the pressure sleeve, its function is to push the pressure sleeve to move to deform the gasket, and to place the socket or plug; the gasket is made of dimethyl vinyl siloxane, which is a rubber material with good elasticity and high temperature resistance , stable in nature. In a word, the present invention has the advantages of simple structure, convenient assembly and disassembly, reliable sealing and low cost, and is suitable for popularization and use of vacuum furnace thermocouple installation and anti-leakage.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is another structural representation of the present invention;

Figure 3 is a schematic structural view of the mount;

Fig. 4 is the structural representation of gasket;

Fig. 5 is the left view of Fig. 4;

Fig. 6 is a kind of use status diagram of the present invention;

Fig. 7 is another usage status diagram of the present invention.

Marked in the picture:

1. Tube body; 2. Mounting seat; 3. Gasket; 4. Pressure sleeve; 5. Stop pin; 6. Jacket nut; 7. Pin hole; 8. Thermocouple; 9. Sealing ring A; 10. Furnace body ; 11. Clamp; 12. Seal ring B.

detailed description

Below in conjunction with the accompanying drawings and preferred embodiments, the specific implementation, structure, features and effects of the anti-leakage device for installing vacuum furnace thermocouples proposed according to the present invention will be described in detail as follows.

Referring to Fig. 1 to Fig. 5, the vacuum furnace thermocouple installation anti-leakage device of the present invention includes a mounting seat 2, a sealing gasket 3, and an outer casing nut 6, wherein: the front part of the mounting seat 2 is fixedly connected with a pipe body 1, a sealing gasket 3, The pressure sleeve 4 is sequentially installed in the inner cavity of the mounting seat 2, the sealing gasket 3 and the pressure sleeve 4 are positioned through the end face, the stop pin 5 is installed between the pressure sleeve 4 and the mounting seat 2, and the outer casing nut 6 is removably mounted on the mounting surface. The outside of the seat 2, and the outer casing nut 6 is press-fitted on the outer end surface of the pressure sleeve 4. The pipe body 1 and the mounting base 2 are welded together. The pipe body 1 is a stainless steel casing. Gasket 3 is made of dimethylvinylsiloxane. The stop pin 5 is installed in the pin hole 7 provided on the mounting base 2 . The outer casing nut 6 is connected with the mounting base 2 through threads.

When in use, refer to Fig. 6 to Fig. 7, put the thermocouple wire 8 through the insulating ceramic tube, pass through the sealing gasket 3, then pass through the mounting base 2 and the tube body 1 in sequence, and then put it into the pressure sleeve 4, the stopper in sequence The movable pin 5 is finally put on the outer casing nut 6, and the outer casing nut 6 pushes the pressure sleeve 4 to squeeze the sealing gasket 3 to be deformed by screwing in the thread, and the sealing gasket 3 wraps tightly on the surface of the thermocouple 8 wire inwardly, and clings to the mounting seat outwardly 2 inner walls. The present invention can be installed on the vacuum furnace body 10 by means of clamps 11 or screw connections, which can ensure firm installation, reliable sealing, compact structure and beautiful appearance. When the threaded installation method is adopted, see Figure 6, one end of the butt joint surface of the mounting seat 2 and the vacuum furnace body 10 is fitted with a sealing ring A9, and the mounting seat 2 is screwed into the extruded sealing ring A9 to be deformed to be close to the butt joint surface of the vacuum furnace body 10; When the hoop 11 is installed, see Figure 7, the sealing ring B12 is placed on the docking surface of the mounting seat 2 and the vacuum furnace body 10, and the clamp 11 tightens the mounting seat 2 so that the sealing ring B12 is deformed and adheres to the docking surface of the vacuum furnace body 10 . The invention has the advantages of simple structure, convenient assembly and disassembly, reliable sealing and low cost, and is suitable for the popularization and use of vacuum furnace thermocouple installation and anti-leakage.

The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Any simple modification, Equivalent changes and modifications still fall within the scope of the technical solution of the present invention.

Claims (6)

1. a vacuum drying oven the installation of TC device for preventing leakage, comprise mount pad (2), sealing gasket (3), cap nut (6), it is characterized in that: mount pad (2) front portion is fixedly connected with body (1), sealing gasket (3), gland (4) are contained in the inner chamber of mount pad (2) successively, sealing gasket (3) is located by end face mutually with gland (4), stop pin (5) is housed between gland (4) and mount pad (2), it is outside that cap nut (6) is releasably contained in mount pad (2), and cap nut (6) is pressed together on the outer face of gland (4).

2. vacuum drying oven the installation of TC device for preventing leakage as claimed in claim 1, is characterized in that: body (1) and mount pad (2) weld together.

3. vacuum drying oven the installation of TC device for preventing leakage as claimed in claim 1, is characterized in that: body (1) is stainless steel sleeve pipe.

4. vacuum drying oven the installation of TC device for preventing leakage as claimed in claim 1, is characterized in that: sealing gasket (3) is made up of dimethylvinyl siloxane.

5. vacuum drying oven the installation of TC device for preventing leakage as claimed in claim 1, is characterized in that: stop pin (5) is arranged in the upper pin-and-hole (7) arranged of mount pad (2).

6. vacuum drying oven the installation of TC device for preventing leakage as claimed in claim 1, is characterized in that: cap nut (6) is connected by screw thread with mount pad (2).